Okay, sure, it's a greatsword made of pure blackness named "Soulripper", and yeah, you constantly hear faint screaming when it's within line of sight, and maybe it tried to consume Dave's barbarian when he picked it up, but it's also a +6 greatsword with flametongue and dragonbane! It's not like we can sell it, so I might as well use it!

Ok, but if I don't then how will I reasonably justify being a chaos goblin?